Concrete mold



May ,20, 1924. 1,494.538

O. L. GENT CONCRETE MOLD Filed Jan. 5, 1923 Sheets3-5heet 1 i? mit (QZ.@CR

WMM y May zo, 1924. 1,494,538

CONCRETE MOLD 76, llll 4 @MMS @ZKM/M Patented May 20, 1924,

UNITED STATES PAT OSCAR LAWRENCE GENT, OF. TULSA, OKLAHOMA.

CONCRETE MOLD.

Application inea Jamai-y 5, 1923. serial noicldsea.

.tain new and usefulImprovements in ,Con` crete Molds, of which the'following is a speciiication. n l l My invention relates tonnproveinents 1n molds and it consists ot the constructions,

combinations, and inode ot operation herein described and claimed. j

An object of the invention is to provide a collapsible sectional inoldtobe used in the construction of reinforced concrete joists for floorslabs. i

A further object ot the invention is to provide a inold for the purposedescribed which is capable of being inade in ditierent sizes so thatvarious arrangements.oit joists can be carried out. j

Other objects and advantages will appear in the :followingspecification, reference -being had to the accompanying drawings, inwhichzy Fig. 1 is a perspective view illustrating a number of thesectional molds assembled preparatory to constructing concrete joist-s,

Fig. 2 isa detail perspective view, parts being in section, illustratingthe concrete joists upon completion, showing how the slabs of concreteand plaster-board are laid in position to nialre a hollow'lioorconstruce tion, L

Fig.v 3 is a detail perspective view oil one of the metal clips by whichthe reinforcing rods are held in place and which later serve as supportsfor the plaster-board,

Fig. 4 is a detail perspective view of one of the molds,

Fig. 5 is a detail plan view of a portion ot the sectional moldconstruction in Fig. 1, Fig. 6 is a section on the line 6 6 kot Fig. 5,

Fig. 7 Fig. 5,

Fig. 8 is a detail perspective View, on the order of Fig. ll,illustrating anioditication in accordanceL with which the mold :is Inadeof sheet metal instead ot' wood as in Fig. 4. y

is a section on the line 7 7 of ksupporting wooden joists 21 tit.

Fig. 9 yis a detail plan view of the sheet nietal` mold construction,`corresponding with Fig. 5,

Fig. 10 is a section on the line YlO-l() ot Fig. 9,

" Fig.-11is a sect-ionen the line 11-11 of Fig. 9,

Fig. 12 is a detail perspective view of one of the bottoni plates,

Fig. -13 is a detail perspective view of one of the corner plates, and

F ig; 14 is adetail perspective View showing how the corners otthesideplates are held together. j T/ze form of the` anemia/lz. in Fig/s.A l Z0'7 illustrates a concrete inold in which inost of the parts are ymade ofwood. It consists of side plates 1,2, 3 and 4 which, in the present ninstance, torni a square. The corners where these side plates `jo1n,arebraced by sheet metal angle pieces 5 and the latter areheld in place bynieans 6,

' The retainingineans 6 may in practice consist of nothing more thannails driven into the wooden sides and hammered over to hold the anglepieces 5 in place. `The wooden sides are put in position on edge onbottoni plates 7, 8, 9 and 10, these in turn being laid across thespaces between vcorner plates 11, 12, 13 and 14. j y

These corner plates have projections 15, 16, 17 and 18 in each of thefour corners deiining cross passages in which the ends of the aforesaidbottoinplates 7, etc.,l are laid. The projections `15, etc. inthepresent instance, are nothing more than blocks of wood of suitable size.l

Underneath of the corner plates 11 etc. are downward projections 19.lThese differ from the projections 15 etc., by extending all the wayacross opposite sides of the bottom surface, in short, being arrangedand intended to define passages 2O in which the The obviouspurpose ofboth the projections 15 etc. and 19 is to provide means forpreventingthe bottom plates 7, 8, 9 and 10 and the wooden joists 21 from slippingout of position.

As it is the purpose of the concrete mold (Btl to form concrete lioorjoists, it is necessary to support the wooden joists 21 with suitableshoring 22 (Fig. 1) which remains in place until the concrete joistshave set. The plates 7, 8, 9 and 10 may be of any desired length, thisdepending on the distance between centers of the concrete joists, butwhen lthe plates are prepared for a particular class of work, theyshould be of uniform length.

1u this connection it is to be observed that the opposing plates 7 and 9are shorter than the opposing plates 8 and 10, the former pair matchingthe distance between the projections 17 and 18 on the corner plates 13and 14.v nearest the observer in Fig. lt, while the other pair extendfrom center to center of the aforesaid plates 7 and 9. Other plates (incompanion mold boues) corresponding to the plates 7 and 9, should be ofequal length and so should corresponding plates 8 and 10. However, itseems quite obvious that this arrangement can be varied, the ultimatepurpose in providing the plates 7, etc. at all being to form a bottom ofthe joist mold.

Reinforcing rods 23 (Fig. 2) are used to provide the necessary strengthfor the concrete joists 24C. Clips 25 are provided for the purpose ofholding the reinforcing rods in position before and during the pouringof the concrete. These clips are preferably made of galvanized iron butmay be made of any other suitable material.

The ends of the clips 25 are bent down and out to respectively formshoulders 26 and pads 27. The side plates 1, 2, 3 and L are set inposition against the shoulders 26 and upon the pads 27 so that after themold plates are removed (Fig. 2) only the shoulders 26 and pads 27 showon the outside of the concrete worlr. The pads serve the useful purposeof attaching means for plaster-boards 28 and in order to fasten theplaster-boards, any acceptable expedient .may be adopted.

Strips 29 are cut and bent up from the upper part of each metal clip 25.These are bent up so as to cross at a place substantially in the centerof the joist channel (between the side and bottom plates). Thereinforcing rods 28 are laid in the place where the strips cross, andthe strips are then twisted around the reinforcing rod (Fig. 2) to holdthe latter firmly in position. The concrete is intended to flow down andaround the metal clip and hold it in lace as part of the concrete -joistFloor slabs 30 are laid in place on top of the concrete joist structure,and when the plasterboards 28 are fined in position a. hollow floorconstruction results.

y ttention is directed to Fig. 1. This: shows in part only what acomplete set of molds for a concrete joist construction will look like.It also illustrates the use of long plates 31 and 32 which might becalled binder plates inasmuch as they are used to hold the outermostmold side plates in place. These may be used in place of the shorterplates 7 etc. around the boundary of the mold formation, and so far asthe purpose of the binder plates 31 and 32 is concerned, it is the sameas that of the aforesaid shorter plates.

The modification n Figs. 8 to 14 involves elements which serve thepurpose of corresponding elements in the form of the mold shown in Figs.1 to 7, the difference being that now sheet metal is made use of insteadof wood. Parts which correspond with parts in the first modificationbear similar reference numerals but `also exponent letters so as todistinguish the modifications.

In'F ig. 8, the side plates 1, 2, 8a and 4:3 are held together in thecorners by angle pieces 5a which are bent up from adjacent side plates,and staples 6a which tit over the edges, as shown. These side platesrest upon bottom plates 7a, 8, 9a and 10a the ends of which restuponcorner plates 11a, 12, 13"L and 14a. The corner plates have upwardprojections 15a, 16, 17a and 18arespectively for the purpose ofproviding passages in which the ends ofthe aforesaid plates fit. Thecorner plates also have downward projections 19a which provide passagesfor the reception of wooden joists 21a, corresponding with the woodenjoists. 21 in Figs. 1 and 4c.

As clearly shown in Fig. S, the various projections described consist ofappropriately stamped portions of the corner plates which are benteither up or down, as the case may be, to provide passages either on topor underneath for the bottom plates and the j oists respectively. Thebottom plates are arranged in long and short pairs so as to carry out ascheme of laying the bottom plates very much on the order of the schemeof laying the wooden bottom plates in Fig. 4. The minor distinction ofthe metallic bottom plate a (for example) being longer 'than the woodenbottom plate 10 in Fig. 4 is to be observed, but as the ultimate purposeof the bottom plates is to provide a tight bottom for the concrete joistform, the manner of arranging the bottom plates is not of primeimportance.

In assembling the side plates la, etc., upon the bottom plates 7 a etc.,use is made of the upstanding projections a, 16a, 17a and 182L to abutthe exposed inner surfaces of the side plates and fix the positionsthereof'. in respect to the bottom plates. Reinforcing rods are made useof as before, and these reinforcing rods rest upon metal clips L havingshoulders 26a and pads 27 a. The shoulders rest against` the insides ofthe side plates and, as in the case in Fig. 4t, form Ll (l spaces tomaintain a uniform `width of the molding space in which the concretejoist is to be formed. The clips have strips 29a to be Wrapped aroundthe reinforcing rods and i hold the latter in place. y v n The bottomplates 'l'a etc. have lateral extensions 33 upon which `the pads `27arest. The shoulders 26a are disposed `at a place in from the edges ofthe bottom` plates sufiiciently far to leave room for the insertion ofthe side plates lil etc. between such shoulders and side flanges 33aonthegbottom plates as is suggestedby` therelativepositioning of theshoulder 26?L and flange 33a in Fig. 8. This arrangement provides aclose joint at the bottom through which none of the plastic materialcany escape, the side plates being `raised from the bottom plates onlythe distance of the `thickness of` This is also the case in Fig. 4f.`

the pads 27. The flanges 3B furnish braces Whichleep the side platesfrom slipping outward` in respect to the bottom plates.

The acl/U @mages may be briefly outlined. After `having erected a systemof molds for the construction of concrete joists, the side plates l, 2,3and l in the wooden construction in Figs. l and 4i, or the side platesl, 2, 3a and 2l `in metallic construction in Fig. 8,y may be removedafter the concrete has sufficiently set, i

so as to more fullyexpose it to the drying action of the surroundingair. rlhe bottom plates and shoring necessarily i remain in place untilthe joists have completely set. rlhe ability to remove the side plates,so `as to expose the concrete `joists to the air, is considered quite anadvantage.

The provision of the metallic clips 25 adds another advantage. These notonly hold the reinforcing rods in place prior to and during the pouringof the concrete, but also provide pads by means of which plaster-boards,metallic ceilings7 etc., may quite readily be fastened in concretejoists.

The. molds are easily erected, are fireresistive (especially in the easeof the modification in Figs. 8 to la), require a minimum amount ofshoring and are strong enough to be used in heavy concrete construction,The mold parts can be used again and again and are not required to bediscarded as is often the case Where concrete constructions are erected.The fact that the molds are collapsible and re-usable makes the moldsystem less expensive `to use for the reasons that the molds can beerected in less time than ordinarily and can be taken down with lesslabor.

Nhile the construction and arrangement of the improved concrete molds as`herein described and claimed, is that of a generally preferred form,obviously modifications `and place underneath the changes' may be madeWithout departing from the spirit ofthe invention or the scope oftheclaims. i f

1. A mold comprising a bottom plate, Coi; ner plates upon which the endsof the bottom plates `are supported, means on 'the corner plates to formpassages to receive `said ends, side platesy to be placed on the bottomplate to define rthe mold space,and means situated. in said mold spaceto be abutted by said side plates to space them apart. t t i i 2. Amold` comprising a bottom plate, cor` ner plates `havingnieans providingpassages in which the endsof the bottom plate rest, means underneath of'the corner plates providing passages 'for supporting structure, sideforming plates to be positioned upon the bottom plate to define amolding i space, and means to support the sideplates inr position duringthe pouring of the plastic material but permitting removal of the sideplates without removing the bottom plate or supporting structure aftersaid material has sufhciently set to permit access of the air thereto. fc

3.y A moldfor`con'crete joists comprising bottom plates laid at anglest0 each other, corner plates having means defining passages into whichthe ends of the bottoni plates'are laid,sideplates stood on edge on the`bottom plates to `define joist molding spaces over the bottom plates,means 1n engagement with the corner plates to support the mold, andmeans-to temporarily hold the side plates together but `permit removalthereof as a part ofthe mold without removing the bottom plates or thesupporting structure. 1

4. A mold for concrete joists comprising Ibottom plates laid vat anglesto each other, corner plates having upward projections defining passagesto receive the ends of said plates, and hold them in position, downwardprojections from said corner plates providing passages, a supportingstructure including joists to occupy said last passages and be held inplace by said projections, side plates stood on edge on the bottomplates, means rsituated in the molding space defined by said 'sideplates and bottom plates including shoulders to be abutted by the sideplates, also including means to hold reinforcingielements in saidspaces, and means at the places where said side plates join temporarilyholding them to*- gether to enable removal of said side plates withoutremoving the supporting structure or bottom plates to permit access ofthe air une t0 the concrete joists to facilitate hardening.

and occupying parts of said passages, side plates stood on edge upon thebottom plates to define molding passages in which said joists areformed, and means situated at the places where the side plates ineet totemporarily hold them together and permit re moval of thel side plateswithout disturbing the other structure` 6. Apparatus of the4 characterdescribed comprising a plurality of bottom plates, corner plates havingupstanding means defining passages in which the ends of the bottomplates rest for support said ends all being` in contact to Jfurnish acontin-uous surface, clips having shoulders terminating in pads uponwhich they stand on the bottoni plates, side plates stood on edge on thepads in contact with the shoulders to insurek uniformity in the moldingspaces, means including in said clips proifiding supports forreinforcing elements, and temporarily fastening means for the sideplates situated at the adjoining ends thereof.

7 Apparatus oi'` the character described comprising a plurality ofcorner plates distributed over an area according to a predeterminedorder, means upstanding on the corner plat-es providing' crossedpassages', botH tom plates having the ends resting in said passages andabut-ting' in such a way that the t'opsurface of the bottom plates iscontinuous, all of the corner plates being occupied excepting tli-e onesat theoutside ot said' area, side plates stood upon the bottom plates todefine a system of crossed inold'- ing spaces, means tobrace andtemporarily hold the ends of said side plates, and long` bottom plateslaid in the aligning passages of the outermost corner plates tobound theoutermost side plates and hold all together'.

oscarsl LAWRENCE ENT.

